Datasheet

 2010 Microchip Technology Inc. DS22064D-page 15
25LC1024
2.9 SECTOR ERASE
The Sector Erase function will erase all bits (FFh)
inside the given sector. A Write Enable (WREN) instruc-
tion must be given prior to attempting a Sector Erase.
This is done by setting CS
low and then clocking out
the proper instruction into the 25LC1024. After all eight
bits of the instruction are transmitted, the CS must be
brought high to set the write enable latch.
The Sector Erase function is entered by driving CS
low, followed by the instruction code (Figure 2-9), and
three address bytes. Any address inside the sector to
be erased is a valid address.
CS
must then be driven high after the last bit if the
address or the Sector Erase will not execute. Once the
CS is driven high, the self-timed Sector Erase cycle is
started. The WIP bit in the STATUS register can be
read to determine when the Sector Erase cycle is
complete.
If a SECTOR ERASE instruction is given to an address
that has been protected by the Block Protect bits (BP0,
BP1) then the sequence will be aborted and no erase
will occur.
See Table 2-3 for Sector Addressing.
FIGURE 2-9: SECTOR ERASE SEQUENCE
SO
SI
SCK
CS
0 234567891011 2930311
0011011023 22 21 20
210
Instruction 24-bit Address
High-Impedance